In recent years, computers have become rapidly popularized, and more and more typesetting work for books and magazines has been completed in the publishing house. After many proofreading and revisions, they are then processed. However, sometimes the layout does not fully consider the compatibility with the back-end output system (RIP), so that the front-end produced electronic files can not be normally output on the back-end output device, such as layout output errors and deviations of the layout rules are more likely to appear The problem. This article discusses these common issues with everyone.
The layout of the book generally includes: Chinese characters, foreign letters, numbers, various symbols, decorative class lines, shading, and images. From the storage method can be roughly divided into encoding (inner code) storage and dot matrix storage, different storage methods of processing in the back-end output is completely different.
1. Common character classes
Chinese characters, foreign letters, numbers, symbols, etc. are stored and processed by multiple internal codes. According to national standards, there are currently two commonly used characters, ie, GB2312-80 contains 6,763 Chinese characters and 682 symbols; GBK (Internal Code Extended Standard) encodes 21003 Chinese characters and 1,038 symbols. The users of the Founder system also commonly use 748 fonts, which contain more than 14,000 characters in simplified Chinese characters. This type of character is produced by adding some fonts, font sizes, decoration, positioning marks, and other control characters to the original layout. . When the back-end output is required to generate a page description file, generally according to the current international standard Postscript file or EPS (Encapsulated Postscript, Encapsulated Single Page PS) file, the file is interpreted and encoded by the RIP, and after the font is restored by calling the font, the laser is controlled. Imagesetter or CTP device for output. If the PS file character encoding and font library are exactly the same as the encoding and font library (PS font library) of the back-end RIP configuration, normal output can be performed; otherwise, it cannot be output normally. The solution is to use the down load method to transfer the characters of the front-end display font without encoding. Instead, the font strokes of characters are directly converted into PS (EPS) files in the form of curves. It is much larger than the former method, and the character quality and output speed are also reduced to some extent, but the dependency on the back-end font library is greatly reduced, which further enhances the reliability and security of the output. These two different output methods have their own advantages and disadvantages. Based on the compatibility of the front-end and back-end systems, they can selectively adopt partial downloading of character setting methods by making changes to the publishing settings.
2. Fonts complement type
For characters that are not in the front and back end fonts, under the premise of guaranteeing the character quality, only by using special writing software (such as the Founder Nuwa supplement word system) to make the code, the word-form file is generated according to the code, Called when the backend is output. This method is basically the same as the storage principle and calling method of the computer standard font library. The common problem of using this method to make up the word is the difference between the glyph description method (vector and curve words) and the back-end output error caused by the different font bases. For example, the suffix of the supplement word file of the Nuwa supplement word software and the vector font is *.BZ, and the *.PFI file of the curve character font is the supplement. Different RIP versions have different recognitions for these two fonts, and vector fonts can be converted into curve fonts. At present, the most commonly used Founder Century RIP system in domestic printing houses and newspaper offices calls the curve font library.
Using the font base standard of the font library, different versions of the font-building software are also different from each other. Commonly there are 484, 512, 1000 and 1024, and the font-based configuration of each font is also different. When the font base configuration used by the font and the back-end RIP type are inconsistent, the output character size differs greatly from the characters in the normal font base. The character baseline and the placeholder are basically the same, but the character's actual height, width and punctuation are similar, so the The RIP output configuration file and the front end must be the same. For example, the word base configuration file BZFONT.INI (stored in /basePFI/ or /BIN/ under the build file installation directory) and the Founder NTRIP configuration file BZFONT.INI (stored in the RIP installation file directory /BIN / Under), can be copied and installed according to different writing systems, but the file BZFONT.INI file name cannot be changed.
3. Modifier class
The storage format of various modified outlines and shadings in the page creation file varies depending on the production system. Since the amount of information is not large and the output is converted into a PS (EPS) file, it can be set to include all download methods. To the file.
4. Image class
The storage of images in a computer generally has two formats of vector graphics and dot matrix graphics. Prepress generally uses a dot matrix format. This type of file is characterized by rich colors, descriptive images, easy to hang the net output component version; the disadvantage is that the file is large, takes up a lot of storage space, and the size of the file The accuracy increases in geometric progression. In order to ensure the printing quality, the image accuracy is selected to be 300 dpi (1.5 to 2 times the print output mesh size of 120 to 175 lines/inch). Due to the limitation of the printing accuracy, the precision is too high and it is unfavorable for the output of the rear end. Too low accuracy will cause the image contour to be blurred and the gradation is not clear.
When selecting the storage file type, it is generally saved as a TIFF format. This format is characterized by good file reproducibility and no distortion. Generally do not save as JPG format, JPG format is a file compression format, although the file is short, but it is a kind of compression ratio obtained by reducing the image quality. The use of TIFF files, although relatively large, but through the use of WINZIP and WINRAR compression tools such as compression, generally can achieve JPG compression, and lossless compression. When outputting a PS (EPS) file, depending on the page production system, the picture may be included in the file or saved separately. At this time, the picture file must be sent to the output center at the same time.
Layout format processing
In addition to the above common problems, the output of the document content, when setting the layout parameters in the layout production process, in order to meet the needs of computer automatic folding (imposition), according to different binding methods, Tiantou, foot, cut (the above should be Including 3mm cutting incisions, ordering and layout, and other page size parameters can be normally set in interactive typesetting software such as FIT, WITS, PagerMaker, CorelDraw, Word, WPS. According to the definition of single code and double code, the books are generally horizontally aligned. The first page is a single code, with the mouth on the left and the incision on the right; the double code is just the opposite. The settings in the software menu are inner (outlet) and outer (outlet). If you use a batch typesetting software (such as 9.0), you need to consider the difference between single and double codes when setting the page. You must set data similar to the parameters of the interactive typesetting when exporting and publishing. Output PS(EPS) files that meet the requirements of the back end. After using computer automatic folding (imposition), it is necessary to pay attention to the output of the printing plate directly on the CTP system. The output methods of the different production back-end output settings are different. Some systems have their own output function options that are compatible with the back-end RIP, such as FIT, WITS, and Founder, etc., and can be set directly for distribution; some systems need to set the corresponding output device system to complete the PS (EPS ) File output, such as PagerMaker, CorelDraw, Freehand, Word, WPS, Execl, etc. This type of page production system should pay attention to the matching of RIP and handoff software when setting up the print driver, such as Founder Century RIP. The Agfa-Avantra 44 v2013.108 print driver is used in the text and the black and white layout, and the Adobe PS print driver is used in the color layout. Select "Postscript (Best Carryability-ADSC)" in the PS option, and select the PPD that matches the photosetter system or the direct platemaking system. The output PS (EPS) file has the highest compatibility and reliability.
Common office automation typesetting systems, such as Word, Execl, etc., generally do not need to make color pages because such systems are suitable for office automation output devices such as color inkjet printers, and the colors use RGB mode. The CMYK mode is used in printing. Due to the color hue, brightness, saturation, and other conversion errors, the color deviation is large, and some RIPs cannot even convert the output.
With the networking of the pre-press system and the printing press, the ink distribution profile (CPC system) is generated by scanning the printing layout, the digital control mode directly called by the printing machine, and the popularization of digital proofing, making direct use of electronic documents. The process of plate making will become a trend and a necessity. This has led us to work hard to learn new technologies, adapt to new process standards, and constantly solve new problems encountered, in an effort to improve the printing quality of books.